From 3f7290f5fd7b5c441b35896dfa3333e2f4989ea4 Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@tavianator.com>
Date: Thu, 18 Jun 2015 23:25:24 -0400
Subject: Add -hidden/-nohidden flags.

---
 bfs.c | 47 +++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 43 insertions(+), 4 deletions(-)

diff --git a/bfs.c b/bfs.c
index e4296e6..7a7b789 100644
--- a/bfs.c
+++ b/bfs.c
@@ -10,22 +10,61 @@
  *********************************************************************/
 
 #include "bftw.h"
+#include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
+
+typedef struct {
+	const char *path;
+	bool hidden;
+} options;
 
 static int callback(const char *fpath, int typeflag, void *ptr) {
+	const options *opts = ptr;
+
+	const char *filename = strrchr(fpath, '/');
+	if (filename) {
+		++filename;
+	} else {
+		filename = fpath + strlen(fpath);
+	}
+
+	if (!opts->hidden && filename[0] == '.') {
+		return BFTW_SKIP_SUBTREE;
+	}
+
 	printf("%s\n", fpath);
 	return BFTW_CONTINUE;
 }
 
 int main(int argc, char* argv[]) {
-	const char* path = ".";
-	if (argc > 1) {
-		path = argv[1];
+	options opts;
+	opts.path = NULL;
+	opts.hidden = true;
+
+	for (int i = 1; i < argc; ++i) {
+		const char *arg = argv[i];
+
+		if (strcmp(arg, "-hidden") == 0) {
+			opts.hidden = true;
+		} else if (strcmp(arg, "-nohidden") == 0) {
+			opts.hidden = false;
+		} else {
+			if (opts.path) {
+				fprintf(stderr, "Duplicate path `%s` on command line.", arg);
+				return EXIT_FAILURE;
+			}
+			opts.path = arg;
+		}
+	}
+
+	if (!opts.path) {
+		opts.path = ".";
 	}
 
 	// TODO: getrlimit(RLIMIT_NOFILE)
-	if (bftw(path, callback, 1024, NULL) != 0) {
+	if (bftw(opts.path, callback, 1024, &opts) != 0) {
 		perror("bftw()");
 		return EXIT_FAILURE;
 	}
-- 
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